Not able to communicate with usb daq device.

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Kulbir 2023-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/1936969-not-able-to-communicate-with-usb-daq-device

评论： Walter Roberson 2023-4-24

hi all, i am not able to communicate with my usb daq device. i am using the windows' COM port in my coding. please help me out. thx

ERROR MESSAGE

Error using serialport

Unable to connect to the serialport device at port 'COM4'. Verify that a device is connected to the port, the port is not in use, and all serialport input

arguments and parameter values are supported by the device.

See related documentation for troubleshooting steps.

Error in testcode2 (line 2)

serialPort = serialport("COM4", 115200); % Replace "COM1" with the appropriate port name

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回答（1 个）

Sarthak 2023-4-21

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Hi Kulbir,

As per my understanding it is difficult to pinpoint the exact reason for the error you are facing however there can be multiple reasons

Make sure the specified COM port matches the port of your USB.
Ensure that the specified port is not already in use.

If you have made sure that you have the required drivers and inputs, you may need to refer to the documentation provided by the manufacturer of your DAQ device or raise a support request for the same.

Here is the link for your reference

https://www.mathworks.com/support/contact_us.html?s_tid=hp_ff_s_support